FAMILY THlORHODACEAE 



857 



Cells: 10 microns by 20 to 25 microns. 



Source: From sea water of Arctic 

 Ocean. 



Habitat: Presumably ubiquitous in 

 the colder portions of the Ocean at least. 



Illustration: Issatchenko, loc. cit., PI. 

 II, fig. 12. 



2. Chromatiimi wanningii (Cohn) Mi- 

 gula. {Monas warmingii Cohn, Beitr. 

 Biol. Pfl., 1, Heft 3, 1875, 167; Migula, 

 Syst. d. Bakt., 2, 1900, 1048.) Named 

 for the Danish botanist, Eugene Warm- 

 ing. 



Cells: 8 by 15 to 20 microns, also 

 smaller (Cohn). 



Illustration: Cohn, loc. cit., PI. VI, 

 fig. 11. 



2b. Chromatium warmingii forma minus 

 Bavendamm. (Die farblosen und roten 

 Schwefelbakterien, Pflanzenforschung, 

 Heft 2, 1924, 127.) Named for the 

 Danish botanist, Eugene Warming. 



Cells: 4 by 6 to 10 microns. 



Illustrations: Bavendamm, loc. cit., 91, 

 fig. 7, and PI. II, fig. 12, a-b. 



3. Chromatium linsbaueri Gicklhorn. 

 (Ber. d. deut. botan. Ges., 39, 1921, 312.) 

 Named for the Austrian botanist, K. 

 Linsbauer. 



Cells: 6 h\ up to 15 microns (Gickl- 

 horn); 6 to 8 microns in width (Ellis, 

 Sulphur Bacteria, London and New 

 York, 1932, 147). Special characteristic 

 is the occurrence of calcium carbonate 

 inclusions. Otherwise resembles Chrn- 

 matium okenii. 



Source: From a pool in the Stiftingtal, 

 near Graz, Austria. 



Habitat: Fresh water. 



Illustrations: Gicklhorn, loc. cit., 314, 

 fig. 1; Ellis, loc. cit., 148, fig. 31. 



4. Chromatium okenii (Ehrenberg) 

 Perty. (Monas okenii Ehrenberg, In- 

 fusionsthierchen, Leipzig, 1838; Perty, 

 Zur Kenntniss kleinster Lebensformen, 



Bern, 1852, 174; Bacilbis okenii Trevisan, 

 I generi e le specie delle Batteriacee, 

 1889, 18; Bacterium okenii DeToni and 

 Trevisan, in Saccardo, Sylloge Fungo- 

 rum, 8, 1889, 1027; Pscudomonas okenii 

 Migula, in Engler and Prantl, Die nattir- 

 lichen Pflanzenfamilien, /, la, 1895, 30.) 

 Named for the German naturalist, L. 

 Oken. This is the type species of genus 

 Chromatium. 



Cells: 5.6 to 6.3 by 7.5 to 15 microns 

 (Cohn); minimum width 4.5 microns 

 (Issatchenko, Borodin Jubilee Vol., 

 1929?, 8); with many transitions to 

 Chromatium weissei (Winogradsky, 

 Schwefelbacterien, Leipzig, 1888, 92). 

 Also: 3.5 by 8 to 12 microns and varying 

 in size from 1 to 15 microns (Manten, 

 Antonie van Leeuwenhoek, 8, 1942, 164). 



Illustrations: Cohn, Beitr. Biol. Pfl., 

 1, Heft 3, 1875, PI. VI, fig. 12; Winograd- 

 sky, loc. cit., PI. IV, fig. 3-4; Issatchenko, 

 Recherches sur les microbes de I'oc^an 

 glacial arctique, Petrograd, 1914, PI. II, 

 fig. 9. 



5. Chromatium weissei Perty. (Perty, 

 Zur Kenntniss kleinster Lebensformen, 

 Bern, 1852, 174; Bacillus weissii Trevi- 

 san, I generi e le specie delle Batteriacee, 

 1889, 18; Bacterium weissii DeToni and 

 Trevisan, in Saccardo, Sylloge Fungo- 

 rum, 8, 1889, 1027.) Named for the 

 zoologist, J. F. Weisse, consequentlj' the 

 more common spellings, Chromatijim 

 weissii or C. weisii are in error. 



Cells: 4.2 by 5.7 to 11.5 microns 

 (Perty); also 3 to 4 by 7 to 9 microns 

 (Issatchenko, Borodin Jubilee Volume, 

 1929?, 8); transitions to Chromatium 

 okenii (Winogradsky, Schwefelbacterien, 

 Leipzig, 1888, 92); transitions to 

 Chromatium minus (Strzeszewski, Bull. 

 Acad. Sci., Cracovie, S^r. B. 1913, 321). 



Illustrations: Winogradsky, loc. cit., 

 PI. IV, fig. 1-2; Miyoshi, Jour. Coll. 

 Sci., Imp. Univ. Tokyo, Japan, 10, 1897, 

 PI. XIV, fig. 15. 



